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  • At sowing 9 January 2018
  • At harvest 15 May 2018




Paddy rice
(Oryza sativa var. Sertani and Kabir)

Soil Type




Polysulphate increased plant height, panicle size, grain weight, disease resistance, and yield by 20%


West Java province, Indonesia.


To evaluate the benefits to paddy rice crop of Polysulphate fertilizer compared to the farmer’s usual fertilizer practice in West Java, Indonesia.


An unreplicated field trial was carried out on two 0.8 ha plots. In the control plot, the farmer applied the usual fertilizer treatment of 250 kg/ha of urea at transplanting and 500 kg/ha of NPK (15:15:15) at 10 and 30 days after transplanting. In the Polysulphate-treated plots, 250 kg/ha of urea was applied at transplanting and 150 kg/ha of Polysulphate was applied at 20 and 35 days after transplanting.


  • With the Polysulphate treatment, the rice yield (9.0 t/ha) was 20% higher than the control plot (7.5 t/ha).
  • The Polysulphate paddy had bigger and stronger panicles compared to the control; the grains were rounder with a more uniform shape and better filling.
  • The average weight of the grains was 9% higher in the plot treated with Polysulphate.
  • Regarding the plant height, the rice in the Polysulphate plot was 8-10 cm taller than the control and appeared less affected by diseases.
  • Plants in the Polysulphate plot were more resistant to lodging or damage caused by wind.
  • Less blast disease (Pyricularia oryzae) and smut were reported in the Polysulphate plot compared to the control plot.
  • There was no identifiable difference in response to Polysulphate between the two rice varieties, Kabir and Sertani.


Higher rice plants in the Polysulphate plot.

Better grain filling and stronger panicles with Polysulphate.

9% higher grain weight in the Polysulphate treated rice compared to the control.